Speed control for motors.



I s. K. EVANS. SPEED CONTROL FOR MOTORS. APPLIGATION FILED NOV.8, 1913.1 1 1 7, 3 1, Patented Nov. 17, 1914.

2 SHEETS-SHEET 1.

S. K. EVANS. SPEED CONTROL FOR MOTORS.

APPLICATION FILED NOV. 8, 1913.

Patented Nov. 17, 1914.

2 SHEETS-SHEET 2.

sanronn KEITH EVANS, or museum), NEW Yonx.

SPEED conrnon' r03 MOTORS.

Specification of Letters Patent.

Patented Nov. 17, 1914.

Application filed November 8, 1913 Serial N e. ?9B,862.

To all whom it may concern:

Be it known that I, SANFORD KEITH Evens, a. citizen of the UnitedStates, residing in Elmsford, county of Westchester,

and State of New York, have invented a new and useful Improvement inSpeed Controls for Motors, of which the following is a specification.

My invention relates particularly to speed controls for motor cars-inwhich an electric contact, adjustable in the path of a contact movingwith the index of a speedometer, is arranged through an electriccontrolling circuit automatically to stop the motor when the car reachesthe speed at which the adjustable contact is set, a key-operated lockbeing provided to lock the said contactin any adjustment, so that itcannot be displaced except by the possessor of the proper key.

In a prior application for patent filed by me August 16, 1912, SerialNo. 715,340, I have described and claimed broadly a lock for theadjustable contact, comprising a lock member in the form of teethadjustable with the contact, a lock member in the form of a rack,movable into and out of engagement with the adjustable lock member, aseries of stops in the shape of teeth on the rack to engage said lockmembers together in any position, and a key, illustrated as actingthrough an ordinary lock, to secure said lock membersin engagement andto release them. *In another and allowed application for patent filed byme March 26, 1913, Serial No. 756,901, I have shown a rotary member andgearing for adjusting a sliding contact, the contact lock consisting ofthe rotary member itself as the adjustable lock member, the movable lockmember being in the form of a tumbler or tumblers in the rotary member.These tumblers engage a series of stops, in the form of teeth, on afixedmemher or case in which the rotary member turns, and the key not onlyengages the rotary member to release the tumblers from the stops, butalso serves as a handle for turning the rotary member and therebyadjusting the contact. In my present applicamember and connectinggearing for adjusting the adjustable contact, and a key-operated lockcomprising a series of stops, for locking the rotary member and contactin -any position. But I employ and claim also tion I use also and claimbroadly a rotaryimproved forms of adjustable and speedmoving contacts,and improved means for adjusting and locking the adjustable contact, ashereinafter set forth. Q Reference is to be had to the accompanymgdrawings forming part of this speci hcatlon in which like parts aredesignated by the. same numbers in all the figures.

F gure 1 is a cross sectional view on the line 1-1, Fig. 2, of aspeedometer of a wellknown type provided with a speed control embodyingmy present invention. Fig. 2 is a rearsectional View of the same on theline 2 -2, Fig. 1. Fig. 3 is a face view of the same partly broken away.Fig. 4 is a rear sectional view on the line 4.4, Fig. 1.

The drawings represent my invention applied to a speedometer of thewell-known Hoffecker or steady hand type, 5 designating the case of thespeedometer, 6 the flexible driving shaft, 7 the governor, 8 thegovernorsoperated lever which swings on the fixed shaft 9, and throughthe connections shown (which need no description here) moves the index10 over the scale of miles 11 so as to indicate the speed of the car. i

l2 and 13 designate the speedrmoving and adjustable contactsrespectively, which by their meeting close the electric-controllingcircuit a-nd stop the motor, as described in my aforesaid priorapplications. To give more power to the moving contact 12, I, in thiscase. fix it on the swinging lever 8, so that it will swing in harmonywith the speed index 10, and I mount the adjustable contact 13-011 onearm 14 of a lever 15 which is likewise pivoted to swing on the fixedshaft 9, so that the contact 13 will swing in its adjustment in the pathof the moving contact 12. :Conveniently to adjust the contact 13, l

here form the adjusting lever 15 with another arm 18, on the end ofwhich is a follower l7 operated by a snail cam 18 against the tension ofa spring 24. The cam 18 is fixed on the rear end of an adjustingcylinder or member 19, which is mounted to revolve around a cvlindricalmember 20, the forward end of which is here shown fixed to a downwardextension 21 of the speedometer .case 5. On the forward end of therotary member 19 is a milled rim 22 for turning it by hand and therebysetting the adjustable contact 13, and also a circular scale 23 of milescorresponding to the speed scale 11 of 2 threat the speedometer, thenumbers of said scale 23 being arranged to show singly through anaperture index 25 in the case extension 21.

The arrangement and adjustment is such that when the rotary member 19 isturned to show any number, as 20, at the index 25, the contact 13.adjusted thereby through the intermediate gearing described will be metby the swinging contact 12 when the speed of the car reaches 20 milesper hour, and the motor will be thereby automatically stopped by theclosing of the controlling circuit, as described in my said" priorapphcations.

For locking and releasing the adjustable contact 13 in any position bythe appropriate key 26, I here employ a lock whose movable lock memberis in the form of a spring-projected pin tumbler 27, working axially inthe fixed member 20, and adapted to engage one of a series of pin-holes,serving as stops, 28, disposed in a circle in and around the rear end ofthe rotary member 19. To operate said loclr l mount revolubly in thefixed member 20, a cylindrical barrel .32, having an axial key-slot 29adapted to be engaged by the appropriate key26, and on its rear end-acam 30 to engage and retract a follower 31 on the pin tumbler 27, sothat when the key 26 is inserted in the slot and turned, the pin tumbler27 will be retracted by the cam 30 from the corresponding pin-hole stop28. The rotary member can then be turned to set the adjustable contactand control at any desired speed as indicated at the aperture 25, andthe adjustable conta ".t and control then looked in that position byturning the barrel 32 by the key until the pin tumbler 27 is releasedand enters the corresponding pin-hole stop 28, and withdrawing the key.

Having thus set forth the nature of my invention and in what manner-thesame is to be performed, I claim as new and desire to secure byLettersPatent:

1. The combination, with the rotary, contact adjusting'member, and thefixed me ber relative. to which the rotary member turns, of a lockconsisting cfa movable locl r member and a series-of stops to engagesaid rotary member and fixed member-together in any relative position, abarrel mounted to turn in the fixed member, a key to engage and turnsaid barrel, and means operated by said key barrel to operate said lock.

2. The combination, with the rotary contact-adjusting member and thefixed member relative to which the rotary member turns, of a barrel toturn in the fixed member, a key to enga e and turn said barrel, a seriesof stops, an a movable lock member to engage said 'rnovableand fixedmember togather in any relative position, a cam operated by thekey-barrel and a cam follower to free the movable lock member from thestops, substantially as described.

The combination, with a speedometer, a contactv moving with speedometerinden, and an electric circuit-controlling contact adjustable along thepath oisaid move; 5

ing contact, of a rotary member havin: numbers corresponding to thespeedometer scale, a fixed member on which the rotary member turns, anindex on the fixed member, and gearing betweenthe rotary member and theadjustable contact, the adjustment being such that when the said indexpoints to any number on said rotary member, the mov ng contact will meetthe adjustableeontacttat that speed. i. lhe combination, with aspeedometer, a contact moving with the speedometer in den, and anelectric circuit-controlling contact adjustable along the path of saidmoving contact, of a rotary contact adjusting member, a contactadjusting cam moved by said rotary member, and a contact adjusting leverhaving a follower actuated by said cam. 5. The combination, with aspeedometer and its lever swinging with the speedometer index, of acontact swinging-with said lever, a contact adjustable in the path ofsaid swinging contact, a levercarrying said ad just-able contact, andmounted to swing on the axis of the swinging contact lever, and 95 meansfor adjusting. and locking said contact. carrying lever.

SAN

In presence of Cnas, H. Swarm-ram, .Creanncn li lB'oirem,

KEITH ,E Q A

